"undir" meaning in Icelandic

{
  "derived": [
    {
      "_dis1": "0 0",
      "word": "ganga undir"
    },
    {
      "_dis1": "0 0",
      "word": "leggja land undir fót"
    },
    {
      "_dis1": "0 0",
      "word": "skrifa undir"
    },
    {
      "_dis1": "0 0",
      "word": "undir beltisstað"
    },
    {
      "_dis1": "0 0",
      "word": "undir eins"
    },
    {
      "_dis1": "0 0",
      "word": "undir fjögur augu"
    },
    {
      "_dis1": "0 0",
      "word": "undirskrift"
    }
  ],
  "etymology_templates": [
    {
      "args": {
        "1": "is",
        "2": "non",
        "3": "undir"
      },
      "expansion": "Old Norse undir",
      "name": "inh"
    },
    {
      "args": {
        "1": "is",
        "2": "gem-pro",
        "3": "*under"
      },
      "expansion": "Proto-Germanic *under",
      "name": "inh"
    }
  ],
  "etymology_text": "From Old Norse undir, from Proto-Germanic *under.",
  "head_templates": [
    {
      "args": {
        "1": "is",
        "2": "preposition"
      },
      "expansion": "undir",
      "name": "head"
    }
  ],
  "lang": "Icelandic",
  "lang_code": "is",
  "pos": "prep",
  "senses": [
    {
      "categories": [
        {
          "_dis": "47 53",
          "kind": "other",
          "name": "Icelandic prepositions",
          "parents": [],
          "source": "w+disamb"
        }
      ],
      "glosses": [
        "under"
      ],
      "id": "en-undir-is-prep-12d0imA3",
      "info_templates": [
        {
          "args": {
            "1": "is",
            "2": "acc"
          },
          "expansion": "[with accusative]",
          "extra_data": {
            "tags": [
              "accusative"
            ]
          },
          "name": "+obj"
        }
      ],
      "links": [
        [
          "under",
          "under"
        ]
      ],
      "qualifier": "motion",
      "raw_glosses": [
        "(motion) under [with accusative]"
      ]
    },
    {
      "antonyms": [
        {
          "word": "yfir"
        }
      ],
      "categories": [
        {
          "_dis": "0 100",
          "kind": "other",
          "name": "Icelandic entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w+disamb"
        },
        {
          "_dis": "47 53",
          "kind": "other",
          "name": "Icelandic prepositions",
          "parents": [],
          "source": "w+disamb"
        },
        {
          "_dis": "0 100",
          "kind": "other",
          "name": "Pages with 2 entries",
          "parents": [],
          "source": "w+disamb"
        },
        {
          "_dis": "0 100",
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w+disamb"
        }
      ],
      "glosses": [
        "under"
      ],
      "id": "en-undir-is-prep-12d0imA31",
      "info_templates": [
        {
          "args": {
            "1": "is",
            "2": "dat"
          },
          "expansion": "[with dative]",
          "extra_data": {
            "tags": [
              "dative"
            ]
          },
          "name": "+obj"
        }
      ],
      "links": [
        [
          "under",
          "under"
        ]
      ],
      "raw_glosses": [
        "(location) under [with dative]"
      ],
      "topics": [
        "location"
      ]
    }
  ],
  "word": "undir"
}

{
  "categories": [
    "Icelandic entries with incorrect language header",
    "Icelandic lemmas",
    "Icelandic prepositions",
    "Icelandic terms derived from Old Norse",
    "Icelandic terms derived from Proto-Germanic",
    "Icelandic terms inherited from Old Norse",
    "Icelandic terms inherited from Proto-Germanic",
    "Pages with 2 entries",
    "Pages with entries"
  ],
  "derived": [
    {
      "word": "ganga undir"
    },
    {
      "word": "leggja land undir fót"
    },
    {
      "word": "skrifa undir"
    },
    {
      "word": "undir beltisstað"
    },
    {
      "word": "undir eins"
    },
    {
      "word": "undir fjögur augu"
    },
    {
      "word": "undirskrift"
    }
  ],
  "etymology_templates": [
    {
      "args": {
        "1": "is",
        "2": "non",
        "3": "undir"
      },
      "expansion": "Old Norse undir",
      "name": "inh"
    },
    {
      "args": {
        "1": "is",
        "2": "gem-pro",
        "3": "*under"
      },
      "expansion": "Proto-Germanic *under",
      "name": "inh"
    }
  ],
  "etymology_text": "From Old Norse undir, from Proto-Germanic *under.",
  "head_templates": [
    {
      "args": {
        "1": "is",
        "2": "preposition"
      },
      "expansion": "undir",
      "name": "head"
    }
  ],
  "lang": "Icelandic",
  "lang_code": "is",
  "pos": "prep",
  "senses": [
    {
      "glosses": [
        "under"
      ],
      "info_templates": [
        {
          "args": {
            "1": "is",
            "2": "acc"
          },
          "expansion": "[with accusative]",
          "extra_data": {
            "tags": [
              "accusative"
            ]
          },
          "name": "+obj"
        }
      ],
      "links": [
        [
          "under",
          "under"
        ]
      ],
      "qualifier": "motion",
      "raw_glosses": [
        "(motion) under [with accusative]"
      ]
    },
    {
      "antonyms": [
        {
          "word": "yfir"
        }
      ],
      "glosses": [
        "under"
      ],
      "info_templates": [
        {
          "args": {
            "1": "is",
            "2": "dat"
          },
          "expansion": "[with dative]",
          "extra_data": {
            "tags": [
              "dative"
            ]
          },
          "name": "+obj"
        }
      ],
      "links": [
        [
          "under",
          "under"
        ]
      ],
      "raw_glosses": [
        "(location) under [with dative]"
      ],
      "topics": [
        "location"
      ]
    }
  ],
  "word": "undir"
}